// result: (Select1 x)
	for {
		if v_0.Op != OpSelect0 {
			break
		}
		x := v_0.Args[0]
		if x.Op != OpS390XFADD || !(b == x.Block) {
			break
		}
		v.reset(OpSelect1)
		v.AddArg(x)
		return true
	}
	// match: (LTDBR (Select0 x:(FSUB _ _)))
	// cond: b == x.Block
	// result: (Select1 x)
	for {
		if v_0.Op != OpSelect0 {
			break
		}
		x := v_0.Args[0]

		call := n.Rhs[0].(*ir.CallExpr)
		if !ir.IsIntrinsicCall(call) {
			s.Fatalf("non-intrinsic AS2FUNC not expanded %v", call)
		}
		v := s.intrinsicCall(call)
		v1 := s.newValue1(ssa.OpSelect0, n.Lhs[0].Type(), v)
		v2 := s.newValue1(ssa.OpSelect1, n.Lhs[1].Type(), v)
		s.assign(n.Lhs[0], v1, false, 0)
		s.assign(n.Lhs[1], v2, false, 0)
		return

	case ir.ODCL:
		n := n.(*ir.Decl)

	case OpRsh8x32:
		return rewriteValuePPC64_OpRsh8x32(v)
	case OpRsh8x64:
		return rewriteValuePPC64_OpRsh8x64(v)
	case OpRsh8x8:
		return rewriteValuePPC64_OpRsh8x8(v)
	case OpSelect0:
		return rewriteValuePPC64_OpSelect0(v)
	case OpSelect1:
		return rewriteValuePPC64_OpSelect1(v)
	case OpSelectN:
		return rewriteValuePPC64_OpSelectN(v)
	case OpSignExt16to32:
		v.Op = OpPPC64MOVHreg

		return rewriteValue386_OpRsh8x16(v)
	case OpRsh8x32:
		return rewriteValue386_OpRsh8x32(v)
	case OpRsh8x64:
		return rewriteValue386_OpRsh8x64(v)
	case OpRsh8x8:
		return rewriteValue386_OpRsh8x8(v)
	case OpSelect0:
		return rewriteValue386_OpSelect0(v)
	case OpSelect1:
		return rewriteValue386_OpSelect1(v)
	case OpSignExt16to32:
		v.Op = Op386MOVWLSX
		return true
	case OpSignExt8to16:
		v.Op = Op386MOVBLSX

		return rewriteValueARM_OpRsh8x16(v)
	case OpRsh8x32:
		return rewriteValueARM_OpRsh8x32(v)
	case OpRsh8x64:
		return rewriteValueARM_OpRsh8x64(v)
	case OpRsh8x8:
		return rewriteValueARM_OpRsh8x8(v)
	case OpSelect0:
		return rewriteValueARM_OpSelect0(v)
	case OpSelect1:
		return rewriteValueARM_OpSelect1(v)
	case OpSignExt16to32:
		v.Op = OpARMMOVHreg
		return true
	case OpSignExt8to16:
		v.Op = OpARMMOVBreg